// SPDX-License-Identifier: GPL-2.0
/*
 * drivers/base/power/wakeup.c - System wakeup events framework
 *
 * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
 */
#define pr_fmt(fmt) "PM: " fmt

#include <generated/deconfig.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/sched/signal.h>
#include <linux/capability.h>
#include <linux/export.h>
#include <linux/suspend.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/pm_wakeirq.h>
#include <trace/events/power.h>

#include "power.h"

//#ifndef CONFIG_SUSPEND
//suspend_state_t pm_suspend_target_state;
//#define pm_suspend_target_state	(PM_SUSPEND_ON)
//#endif

//#define list_for_each_entry_rcu_locked(pos, head, member) \
//	list_for_each_entry_rcu(pos, head, member, \
//		srcu_read_lock_held(&wakeup_srcu))
///*
// * If set, the suspend/hibernate code will abort transitions to a sleep state
// * if wakeup events are registered during or immediately before the transition.
// */
//bool events_check_enabled __read_mostly;

///* First wakeup IRQ seen by the kernel in the last cycle. */
//unsigned int pm_wakeup_irq __read_mostly;

///* If greater than 0 and the system is suspending, terminate the suspend. */
//static atomic_t pm_abort_suspend __read_mostly;

///*
// * Combined counters of registered wakeup events and wakeup events in progress.
// * They need to be modified together atomically, so it's better to use one
// * atomic variable to hold them both.
// */
//static atomic_t combined_event_count = ATOMIC_INIT(0);

//#define IN_PROGRESS_BITS	(sizeof(int) * 4)
//#define MAX_IN_PROGRESS		((1 << IN_PROGRESS_BITS) - 1)

//static void split_counters(unsigned int *cnt, unsigned int *inpr)
//{
//	unsigned int comb = atomic_read(&combined_event_count);

//	*cnt = (comb >> IN_PROGRESS_BITS);
//	*inpr = comb & MAX_IN_PROGRESS;
//}

///* A preserved old value of the events counter. */
//static unsigned int saved_count;

//static DEFINE_RAW_SPINLOCK(events_lock);

//static void pm_wakeup_timer_fn(struct timer_list *t);

//static LIST_HEAD(wakeup_sources);

//static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);

//DEFINE_STATIC_SRCU(wakeup_srcu);

//static struct wakeup_source deleted_ws = {
//	.name = "deleted",
//	.lock =  __SPIN_LOCK_UNLOCKED(deleted_ws.lock),
//};

//static DEFINE_IDA(wakeup_ida);

///**
// * wakeup_source_create - Create a struct wakeup_source object.
// * @name: Name of the new wakeup source.
// */
//struct wakeup_source *wakeup_source_create(const char *name)
//{
//	struct wakeup_source *ws;
//	const char *ws_name;
//	int id;

//	ws = kzalloc(sizeof(*ws), GFP_KERNEL);
//	if (!ws)
//		goto err_ws;

//	ws_name = kstrdup_const(name, GFP_KERNEL);
//	if (!ws_name)
//		goto err_name;
//	ws->name = ws_name;

//	id = ida_alloc(&wakeup_ida, GFP_KERNEL);
//	if (id < 0)
//		goto err_id;
//	ws->id = id;

//	return ws;

//err_id:
//	kfree_const(ws->name);
//err_name:
//	kfree(ws);
//err_ws:
//	return NULL;
//}
//EXPORT_SYMBOL_GPL(wakeup_source_create);

///*
// * Record wakeup_source statistics being deleted into a dummy wakeup_source.
// */
//static void wakeup_source_record(struct wakeup_source *ws)
//{
//	unsigned long flags;

//	spin_lock_irqsave(&deleted_ws.lock, flags);

//	if (ws->event_count) {
//		deleted_ws.total_time =
//			ktime_add(deleted_ws.total_time, ws->total_time);
//		deleted_ws.prevent_sleep_time =
//			ktime_add(deleted_ws.prevent_sleep_time,
//				  ws->prevent_sleep_time);
//		deleted_ws.max_time =
//			ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?
//				deleted_ws.max_time : ws->max_time;
//		deleted_ws.event_count += ws->event_count;
//		deleted_ws.active_count += ws->active_count;
//		deleted_ws.relax_count += ws->relax_count;
//		deleted_ws.expire_count += ws->expire_count;
//		deleted_ws.wakeup_count += ws->wakeup_count;
//	}

//	spin_unlock_irqrestore(&deleted_ws.lock, flags);
//}

//static void wakeup_source_free(struct wakeup_source *ws)
//{
//	ida_free(&wakeup_ida, ws->id);
//	kfree_const(ws->name);
//	kfree(ws);
//}

///**
// * wakeup_source_destroy - Destroy a struct wakeup_source object.
// * @ws: Wakeup source to destroy.
// *
// * Use only for wakeup source objects created with wakeup_source_create().
// */
//void wakeup_source_destroy(struct wakeup_source *ws)
//{
//	if (!ws)
//		return;

//	__pm_relax(ws);
//	wakeup_source_record(ws);
//	wakeup_source_free(ws);
//}
//EXPORT_SYMBOL_GPL(wakeup_source_destroy);

///**
// * wakeup_source_add - Add given object to the list of wakeup sources.
// * @ws: Wakeup source object to add to the list.
// */
//void wakeup_source_add(struct wakeup_source *ws)
//{
//	unsigned long flags;

//	if (WARN_ON(!ws))
//		return;

//	spin_lock_init(&ws->lock);
//	timer_setup(&ws->timer, pm_wakeup_timer_fn, 0);
//	ws->active = false;

//	raw_spin_lock_irqsave(&events_lock, flags);
//	list_add_rcu(&ws->entry, &wakeup_sources);
//	raw_spin_unlock_irqrestore(&events_lock, flags);
//}
//EXPORT_SYMBOL_GPL(wakeup_source_add);

///**
// * wakeup_source_remove - Remove given object from the wakeup sources list.
// * @ws: Wakeup source object to remove from the list.
// */
//void wakeup_source_remove(struct wakeup_source *ws)
//{
//	unsigned long flags;

//	if (WARN_ON(!ws))
//		return;

//	raw_spin_lock_irqsave(&events_lock, flags);
//	list_del_rcu(&ws->entry);
//	raw_spin_unlock_irqrestore(&events_lock, flags);
//	synchronize_srcu(&wakeup_srcu);

//	del_timer_sync(&ws->timer);
//	/*
//	 * Clear timer.function to make wakeup_source_not_registered() treat
//	 * this wakeup source as not registered.
//	 */
//	ws->timer.function = NULL;
//}
//EXPORT_SYMBOL_GPL(wakeup_source_remove);

///**
// * wakeup_source_register - Create wakeup source and add it to the list.
// * @dev: Device this wakeup source is associated with (or NULL if virtual).
// * @name: Name of the wakeup source to register.
// */
//struct wakeup_source *wakeup_source_register(struct device *dev,
//					     const char *name)
//{
//	struct wakeup_source *ws;
//	int ret;

//	ws = wakeup_source_create(name);
//	if (ws) {
//		if (!dev || device_is_registered(dev)) {
//			ret = wakeup_source_sysfs_add(dev, ws);
//			if (ret) {
//				wakeup_source_free(ws);
//				return NULL;
//			}
//		}
//		wakeup_source_add(ws);
//	}
//	return ws;
//}
//EXPORT_SYMBOL_GPL(wakeup_source_register);

///**
// * wakeup_source_unregister - Remove wakeup source from the list and remove it.
// * @ws: Wakeup source object to unregister.
// */
//void wakeup_source_unregister(struct wakeup_source *ws)
//{
//	if (ws) {
//		wakeup_source_remove(ws);
//		if (ws->dev)
//			wakeup_source_sysfs_remove(ws);

//		wakeup_source_destroy(ws);
//	}
//}
//EXPORT_SYMBOL_GPL(wakeup_source_unregister);

///**
// * wakeup_sources_read_lock - Lock wakeup source list for read.
// *
// * Returns an index of srcu lock for struct wakeup_srcu.
// * This index must be passed to the matching wakeup_sources_read_unlock().
// */
//int wakeup_sources_read_lock(void)
//{
//	return srcu_read_lock(&wakeup_srcu);
//}
//EXPORT_SYMBOL_GPL(wakeup_sources_read_lock);

///**
// * wakeup_sources_read_unlock - Unlock wakeup source list.
// * @idx: return value from corresponding wakeup_sources_read_lock()
// */
//void wakeup_sources_read_unlock(int idx)
//{
//	srcu_read_unlock(&wakeup_srcu, idx);
//}
//EXPORT_SYMBOL_GPL(wakeup_sources_read_unlock);

///**
// * wakeup_sources_walk_start - Begin a walk on wakeup source list
// *
// * Returns first object of the list of wakeup sources.
// *
// * Note that to be safe, wakeup sources list needs to be locked by calling
// * wakeup_source_read_lock() for this.
// */
//struct wakeup_source *wakeup_sources_walk_start(void)
//{
//	struct list_head *ws_head = &wakeup_sources;

//	return list_entry_rcu(ws_head->next, struct wakeup_source, entry);
//}
//EXPORT_SYMBOL_GPL(wakeup_sources_walk_start);

///**
// * wakeup_sources_walk_next - Get next wakeup source from the list
// * @ws: Previous wakeup source object
// *
// * Note that to be safe, wakeup sources list needs to be locked by calling
// * wakeup_source_read_lock() for this.
// */
//struct wakeup_source *wakeup_sources_walk_next(struct wakeup_source *ws)
//{
//	struct list_head *ws_head = &wakeup_sources;

//	return list_next_or_null_rcu(ws_head, &ws->entry,
//				struct wakeup_source, entry);
//}
//EXPORT_SYMBOL_GPL(wakeup_sources_walk_next);

///**
// * device_wakeup_attach - Attach a wakeup source object to a device object.
// * @dev: Device to handle.
// * @ws: Wakeup source object to attach to @dev.
// *
// * This causes @dev to be treated as a wakeup device.
// */
//static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws)
//{
//	spin_lock_irq(&dev->power.lock);
//	if (dev->power.wakeup) {
//		spin_unlock_irq(&dev->power.lock);
//		return -EEXIST;
//	}
//	dev->power.wakeup = ws;
//	if (dev->power.wakeirq)
//		device_wakeup_attach_irq(dev, dev->power.wakeirq);
//	spin_unlock_irq(&dev->power.lock);
//	return 0;
//}

///**
// * device_wakeup_enable - Enable given device to be a wakeup source.
// * @dev: Device to handle.
// *
// * Create a wakeup source object, register it and attach it to @dev.
// */
//int device_wakeup_enable(struct device *dev)
//{
//	struct wakeup_source *ws;
//	int ret;

//	if (!dev || !dev->power.can_wakeup)
//		return -EINVAL;

//	if (pm_suspend_target_state != PM_SUSPEND_ON)
//		dev_dbg(dev, "Suspicious %s() during system transition!\n", __func__);

//	ws = wakeup_source_register(dev, dev_name(dev));
//	if (!ws)
//		return -ENOMEM;

//	ret = device_wakeup_attach(dev, ws);
//	if (ret)
//		wakeup_source_unregister(ws);

//	return ret;
//}
//EXPORT_SYMBOL_GPL(device_wakeup_enable);

///**
// * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
// * @dev: Device to handle
// * @wakeirq: Device specific wakeirq entry
// *
// * Attach a device wakeirq to the wakeup source so the device
// * wake IRQ can be configured automatically for suspend and
// * resume.
// *
// * Call under the device's power.lock lock.
// */
//void device_wakeup_attach_irq(struct device *dev,
//			     struct wake_irq *wakeirq)
//{
//	struct wakeup_source *ws;

//	ws = dev->power.wakeup;
//	if (!ws)
//		return;

//	if (ws->wakeirq)
//		dev_err(dev, "Leftover wakeup IRQ found, overriding\n");

//	ws->wakeirq = wakeirq;
//}

///**
// * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
// * @dev: Device to handle
// *
// * Removes a device wakeirq from the wakeup source.
// *
// * Call under the device's power.lock lock.
// */
//void device_wakeup_detach_irq(struct device *dev)
//{
//	struct wakeup_source *ws;

//	ws = dev->power.wakeup;
//	if (ws)
//		ws->wakeirq = NULL;
//}

///**
// * device_wakeup_arm_wake_irqs(void)
// *
// * Itereates over the list of device wakeirqs to arm them.
// */
//void device_wakeup_arm_wake_irqs(void)
//{
//	struct wakeup_source *ws;
//	int srcuidx;

//	srcuidx = srcu_read_lock(&wakeup_srcu);
//	list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry)
//		dev_pm_arm_wake_irq(ws->wakeirq);
//	srcu_read_unlock(&wakeup_srcu, srcuidx);
//}

///**
// * device_wakeup_disarm_wake_irqs(void)
// *
// * Itereates over the list of device wakeirqs to disarm them.
// */
//void device_wakeup_disarm_wake_irqs(void)
//{
//	struct wakeup_source *ws;
//	int srcuidx;

//	srcuidx = srcu_read_lock(&wakeup_srcu);
//	list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry)
//		dev_pm_disarm_wake_irq(ws->wakeirq);
//	srcu_read_unlock(&wakeup_srcu, srcuidx);
//}

///**
// * device_wakeup_detach - Detach a device's wakeup source object from it.
// * @dev: Device to detach the wakeup source object from.
// *
// * After it returns, @dev will not be treated as a wakeup device any more.
// */
//static struct wakeup_source *device_wakeup_detach(struct device *dev)
//{
//	struct wakeup_source *ws;

//	spin_lock_irq(&dev->power.lock);
//	ws = dev->power.wakeup;
//	dev->power.wakeup = NULL;
//	spin_unlock_irq(&dev->power.lock);
//	return ws;
//}

/**
 * device_wakeup_disable - Do not regard a device as a wakeup source any more.
 * @dev: Device to handle.
 *
 * Detach the @dev's wakeup source object from it, unregister this wakeup source
 * object and destroy it.
 */
int device_wakeup_disable(struct device *dev)
{
//	struct wakeup_source *ws;

//	if (!dev || !dev->power.can_wakeup)
//		return -EINVAL;

//	ws = device_wakeup_detach(dev);
//	wakeup_source_unregister(ws);
	return 0;
}
EXPORT_SYMBOL_GPL(device_wakeup_disable);

///**
// * device_set_wakeup_capable - Set/reset device wakeup capability flag.
// * @dev: Device to handle.
// * @capable: Whether or not @dev is capable of waking up the system from sleep.
// *
// * If @capable is set, set the @dev's power.can_wakeup flag and add its
// * wakeup-related attributes to sysfs.  Otherwise, unset the @dev's
// * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
// *
// * This function may sleep and it can't be called from any context where
// * sleeping is not allowed.
// */
//void device_set_wakeup_capable(struct device *dev, bool capable)
//{
//	if (!!dev->power.can_wakeup == !!capable)
//		return;

//	dev->power.can_wakeup = capable;
//	if (device_is_registered(dev) && !list_empty(&dev->power.entry)) {
//		if (capable) {
//			int ret = wakeup_sysfs_add(dev);

//			if (ret)
//				dev_info(dev, "Wakeup sysfs attributes not added\n");
//		} else {
//			wakeup_sysfs_remove(dev);
//		}
//	}
//}
//EXPORT_SYMBOL_GPL(device_set_wakeup_capable);

///**
// * device_init_wakeup - Device wakeup initialization.
// * @dev: Device to handle.
// * @enable: Whether or not to enable @dev as a wakeup device.
// *
// * By default, most devices should leave wakeup disabled.  The exceptions are
// * devices that everyone expects to be wakeup sources: keyboards, power buttons,
// * possibly network interfaces, etc.  Also, devices that don't generate their
// * own wakeup requests but merely forward requests from one bus to another
// * (like PCI bridges) should have wakeup enabled by default.
// */
//int device_init_wakeup(struct device *dev, bool enable)
//{
//	int ret = 0;

//	if (!dev)
//		return -EINVAL;

//	if (enable) {
//		device_set_wakeup_capable(dev, true);
//		ret = device_wakeup_enable(dev);
//	} else {
//		device_wakeup_disable(dev);
//		device_set_wakeup_capable(dev, false);
//	}

//	return ret;
//}
//EXPORT_SYMBOL_GPL(device_init_wakeup);

///**
// * device_set_wakeup_enable - Enable or disable a device to wake up the system.
// * @dev: Device to handle.
// */
//int device_set_wakeup_enable(struct device *dev, bool enable)
//{
//	return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev);
//}
//EXPORT_SYMBOL_GPL(device_set_wakeup_enable);

///**
// * wakeup_source_not_registered - validate the given wakeup source.
// * @ws: Wakeup source to be validated.
// */
//static bool wakeup_source_not_registered(struct wakeup_source *ws)
//{
//	/*
//	 * Use timer struct to check if the given source is initialized
//	 * by wakeup_source_add.
//	 */
//	return ws->timer.function != pm_wakeup_timer_fn;
//}

///*
// * The functions below use the observation that each wakeup event starts a
// * period in which the system should not be suspended.  The moment this period
// * will end depends on how the wakeup event is going to be processed after being
// * detected and all of the possible cases can be divided into two distinct
// * groups.
// *
// * First, a wakeup event may be detected by the same functional unit that will
// * carry out the entire processing of it and possibly will pass it to user space
// * for further processing.  In that case the functional unit that has detected
// * the event may later "close" the "no suspend" period associated with it
// * directly as soon as it has been dealt with.  The pair of pm_stay_awake() and
// * pm_relax(), balanced with each other, is supposed to be used in such
// * situations.
// *
// * Second, a wakeup event may be detected by one functional unit and processed
// * by another one.  In that case the unit that has detected it cannot really
// * "close" the "no suspend" period associated with it, unless it knows in
// * advance what's going to happen to the event during processing.  This
// * knowledge, however, may not be available to it, so it can simply specify time
// * to wait before the system can be suspended and pass it as the second
// * argument of pm_wakeup_event().
// *
// * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
// * "no suspend" period will be ended either by the pm_relax(), or by the timer
// * function executed when the timer expires, whichever comes first.
// */

///**
// * wakup_source_activate - Mark given wakeup source as active.
// * @ws: Wakeup source to handle.
// *
// * Update the @ws' statistics and, if @ws has just been activated, notify the PM
// * core of the event by incrementing the counter of of wakeup events being
// * processed.
// */
//static void wakeup_source_activate(struct wakeup_source *ws)
//{
//	unsigned int cec;

//	if (WARN_ONCE(wakeup_source_not_registered(ws),
//			"unregistered wakeup source\n"))
//		return;

//	ws->active = true;
//	ws->active_count++;
//	ws->last_time = ktime_get();
//	if (ws->autosleep_enabled)
//		ws->start_prevent_time = ws->last_time;

//	/* Increment the counter of events in progress. */
//	cec = atomic_inc_return(&combined_event_count);

//	trace_wakeup_source_activate(ws->name, cec);
//}

///**
// * wakeup_source_report_event - Report wakeup event using the given source.
// * @ws: Wakeup source to report the event for.
// * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
// */
//static void wakeup_source_report_event(struct wakeup_source *ws, bool hard)
//{
//	ws->event_count++;
//	/* This is racy, but the counter is approximate anyway. */
//	if (events_check_enabled)
//		ws->wakeup_count++;

//	if (!ws->active)
//		wakeup_source_activate(ws);

//	if (hard)
//		pm_system_wakeup();
//}

///**
// * __pm_stay_awake - Notify the PM core of a wakeup event.
// * @ws: Wakeup source object associated with the source of the event.
// *
// * It is safe to call this function from interrupt context.
// */
//void __pm_stay_awake(struct wakeup_source *ws)
//{
//	unsigned long flags;

//	if (!ws)
//		return;

//	spin_lock_irqsave(&ws->lock, flags);

//	wakeup_source_report_event(ws, false);
//	del_timer(&ws->timer);
//	ws->timer_expires = 0;

//	spin_unlock_irqrestore(&ws->lock, flags);
//}
//EXPORT_SYMBOL_GPL(__pm_stay_awake);

///**
// * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
// * @dev: Device the wakeup event is related to.
// *
// * Notify the PM core of a wakeup event (signaled by @dev) by calling
// * __pm_stay_awake for the @dev's wakeup source object.
// *
// * Call this function after detecting of a wakeup event if pm_relax() is going
// * to be called directly after processing the event (and possibly passing it to
// * user space for further processing).
// */
//void pm_stay_awake(struct device *dev)
//{
//	unsigned long flags;

//	if (!dev)
//		return;

//	spin_lock_irqsave(&dev->power.lock, flags);
//	__pm_stay_awake(dev->power.wakeup);
//	spin_unlock_irqrestore(&dev->power.lock, flags);
//}
//EXPORT_SYMBOL_GPL(pm_stay_awake);

//#ifdef CONFIG_PM_AUTOSLEEP
//static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now)
//{
//	ktime_t delta = ktime_sub(now, ws->start_prevent_time);
//	ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta);
//}
//#else
//static inline void update_prevent_sleep_time(struct wakeup_source *ws,
//					     ktime_t now) {}
//#endif

///**
// * wakup_source_deactivate - Mark given wakeup source as inactive.
// * @ws: Wakeup source to handle.
// *
// * Update the @ws' statistics and notify the PM core that the wakeup source has
// * become inactive by decrementing the counter of wakeup events being processed
// * and incrementing the counter of registered wakeup events.
// */
//static void wakeup_source_deactivate(struct wakeup_source *ws)
//{
//	unsigned int cnt, inpr, cec;
//	ktime_t duration;
//	ktime_t now;

//	ws->relax_count++;
//	/*
//	 * __pm_relax() may be called directly or from a timer function.
//	 * If it is called directly right after the timer function has been
//	 * started, but before the timer function calls __pm_relax(), it is
//	 * possible that __pm_stay_awake() will be called in the meantime and
//	 * will set ws->active.  Then, ws->active may be cleared immediately
//	 * by the __pm_relax() called from the timer function, but in such a
//	 * case ws->relax_count will be different from ws->active_count.
//	 */
//	if (ws->relax_count != ws->active_count) {
//		ws->relax_count--;
//		return;
//	}

//	ws->active = false;

//	now = ktime_get();
//	duration = ktime_sub(now, ws->last_time);
//	ws->total_time = ktime_add(ws->total_time, duration);
//	if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time))
//		ws->max_time = duration;

//	ws->last_time = now;
//	del_timer(&ws->timer);
//	ws->timer_expires = 0;

//	if (ws->autosleep_enabled)
//		update_prevent_sleep_time(ws, now);

//	/*
//	 * Increment the counter of registered wakeup events and decrement the
//	 * couter of wakeup events in progress simultaneously.
//	 */
//	cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count);
//	trace_wakeup_source_deactivate(ws->name, cec);

//	split_counters(&cnt, &inpr);
//	if (!inpr && waitqueue_active(&wakeup_count_wait_queue))
//		wake_up(&wakeup_count_wait_queue);
//}

///**
// * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
// * @ws: Wakeup source object associated with the source of the event.
// *
// * Call this function for wakeup events whose processing started with calling
// * __pm_stay_awake().
// *
// * It is safe to call it from interrupt context.
// */
//void __pm_relax(struct wakeup_source *ws)
//{
//	unsigned long flags;

//	if (!ws)
//		return;

//	spin_lock_irqsave(&ws->lock, flags);
//	if (ws->active)
//		wakeup_source_deactivate(ws);
//	spin_unlock_irqrestore(&ws->lock, flags);
//}
//EXPORT_SYMBOL_GPL(__pm_relax);

///**
// * pm_relax - Notify the PM core that processing of a wakeup event has ended.
// * @dev: Device that signaled the event.
// *
// * Execute __pm_relax() for the @dev's wakeup source object.
// */
//void pm_relax(struct device *dev)
//{
//	unsigned long flags;

//	if (!dev)
//		return;

//	spin_lock_irqsave(&dev->power.lock, flags);
//	__pm_relax(dev->power.wakeup);
//	spin_unlock_irqrestore(&dev->power.lock, flags);
//}
//EXPORT_SYMBOL_GPL(pm_relax);

///**
// * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
// * @data: Address of the wakeup source object associated with the event source.
// *
// * Call wakeup_source_deactivate() for the wakeup source whose address is stored
// * in @data if it is currently active and its timer has not been canceled and
// * the expiration time of the timer is not in future.
// */
//static void pm_wakeup_timer_fn(struct timer_list *t)
//{
//	struct wakeup_source *ws = from_timer(ws, t, timer);
//	unsigned long flags;

//	spin_lock_irqsave(&ws->lock, flags);

//	if (ws->active && ws->timer_expires
//	    && time_after_eq(jiffies, ws->timer_expires)) {
//		wakeup_source_deactivate(ws);
//		ws->expire_count++;
//	}

//	spin_unlock_irqrestore(&ws->lock, flags);
//}

///**
// * pm_wakeup_ws_event - Notify the PM core of a wakeup event.
// * @ws: Wakeup source object associated with the event source.
// * @msec: Anticipated event processing time (in milliseconds).
// * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
// *
// * Notify the PM core of a wakeup event whose source is @ws that will take
// * approximately @msec milliseconds to be processed by the kernel.  If @ws is
// * not active, activate it.  If @msec is nonzero, set up the @ws' timer to
// * execute pm_wakeup_timer_fn() in future.
// *
// * It is safe to call this function from interrupt context.
// */
//void pm_wakeup_ws_event(struct wakeup_source *ws, unsigned int msec, bool hard)
//{
//	unsigned long flags;
//	unsigned long expires;

//	if (!ws)
//		return;

//	spin_lock_irqsave(&ws->lock, flags);

//	wakeup_source_report_event(ws, hard);

//	if (!msec) {
//		wakeup_source_deactivate(ws);
//		goto unlock;
//	}

//	expires = jiffies + msecs_to_jiffies(msec);
//	if (!expires)
//		expires = 1;

//	if (!ws->timer_expires || time_after(expires, ws->timer_expires)) {
//		mod_timer(&ws->timer, expires);
//		ws->timer_expires = expires;
//	}

// unlock:
//	spin_unlock_irqrestore(&ws->lock, flags);
//}
//EXPORT_SYMBOL_GPL(pm_wakeup_ws_event);

///**
// * pm_wakeup_dev_event - Notify the PM core of a wakeup event.
// * @dev: Device the wakeup event is related to.
// * @msec: Anticipated event processing time (in milliseconds).
// * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
// *
// * Call pm_wakeup_ws_event() for the @dev's wakeup source object.
// */
//void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard)
//{
//	unsigned long flags;

//	if (!dev)
//		return;

//	spin_lock_irqsave(&dev->power.lock, flags);
//	pm_wakeup_ws_event(dev->power.wakeup, msec, hard);
//	spin_unlock_irqrestore(&dev->power.lock, flags);
//}
//EXPORT_SYMBOL_GPL(pm_wakeup_dev_event);

//void pm_print_active_wakeup_sources(void)
//{
//	struct wakeup_source *ws;
//	int srcuidx, active = 0;
//	struct wakeup_source *last_activity_ws = NULL;

//	srcuidx = srcu_read_lock(&wakeup_srcu);
//	list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) {
//		if (ws->active) {
//			pm_pr_dbg("active wakeup source: %s\n", ws->name);
//			active = 1;
//		} else if (!active &&
//			   (!last_activity_ws ||
//			    ktime_to_ns(ws->last_time) >
//			    ktime_to_ns(last_activity_ws->last_time))) {
//			last_activity_ws = ws;
//		}
//	}

//	if (!active && last_activity_ws)
//		pm_pr_dbg("last active wakeup source: %s\n",
//			last_activity_ws->name);
//	srcu_read_unlock(&wakeup_srcu, srcuidx);
//}
//EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources);

///**
// * pm_wakeup_pending - Check if power transition in progress should be aborted.
// *
// * Compare the current number of registered wakeup events with its preserved
// * value from the past and return true if new wakeup events have been registered
// * since the old value was stored.  Also return true if the current number of
// * wakeup events being processed is different from zero.
// */
//bool pm_wakeup_pending(void)
//{
//	unsigned long flags;
//	bool ret = false;

//	raw_spin_lock_irqsave(&events_lock, flags);
//	if (events_check_enabled) {
//		unsigned int cnt, inpr;

//		split_counters(&cnt, &inpr);
//		ret = (cnt != saved_count || inpr > 0);
//		events_check_enabled = !ret;
//	}
//	raw_spin_unlock_irqrestore(&events_lock, flags);

//	if (ret) {
//		pm_pr_dbg("Wakeup pending, aborting suspend\n");
//		pm_print_active_wakeup_sources();
//	}

//	return ret || atomic_read(&pm_abort_suspend) > 0;
//}

//void pm_system_wakeup(void)
//{
//	atomic_inc(&pm_abort_suspend);
//	s2idle_wake();
//}
//EXPORT_SYMBOL_GPL(pm_system_wakeup);

//void pm_system_cancel_wakeup(void)
//{
//	atomic_dec_if_positive(&pm_abort_suspend);
//}

//void pm_wakeup_clear(bool reset)
//{
//	pm_wakeup_irq = 0;
//	if (reset)
//		atomic_set(&pm_abort_suspend, 0);
//}

//void pm_system_irq_wakeup(unsigned int irq_number)
//{
//	if (pm_wakeup_irq == 0) {
//		pm_wakeup_irq = irq_number;
//		pm_system_wakeup();
//	}
//}

///**
// * pm_get_wakeup_count - Read the number of registered wakeup events.
// * @count: Address to store the value at.
// * @block: Whether or not to block.
// *
// * Store the number of registered wakeup events at the address in @count.  If
// * @block is set, block until the current number of wakeup events being
// * processed is zero.
// *
// * Return 'false' if the current number of wakeup events being processed is
// * nonzero.  Otherwise return 'true'.
// */
//bool pm_get_wakeup_count(unsigned int *count, bool block)
//{
//	unsigned int cnt, inpr;

//	if (block) {
//		DEFINE_WAIT(wait);

//		for (;;) {
//			prepare_to_wait(&wakeup_count_wait_queue, &wait,
//					TASK_INTERRUPTIBLE);
//			split_counters(&cnt, &inpr);
//			if (inpr == 0 || signal_pending(current))
//				break;
//			pm_print_active_wakeup_sources();
//			schedule();
//		}
//		finish_wait(&wakeup_count_wait_queue, &wait);
//	}

//	split_counters(&cnt, &inpr);
//	*count = cnt;
//	return !inpr;
//}

///**
// * pm_save_wakeup_count - Save the current number of registered wakeup events.
// * @count: Value to compare with the current number of registered wakeup events.
// *
// * If @count is equal to the current number of registered wakeup events and the
// * current number of wakeup events being processed is zero, store @count as the
// * old number of registered wakeup events for pm_check_wakeup_events(), enable
// * wakeup events detection and return 'true'.  Otherwise disable wakeup events
// * detection and return 'false'.
// */
//bool pm_save_wakeup_count(unsigned int count)
//{
//	unsigned int cnt, inpr;
//	unsigned long flags;

//	events_check_enabled = false;
//	raw_spin_lock_irqsave(&events_lock, flags);
//	split_counters(&cnt, &inpr);
//	if (cnt == count && inpr == 0) {
//		saved_count = count;
//		events_check_enabled = true;
//	}
//	raw_spin_unlock_irqrestore(&events_lock, flags);
//	return events_check_enabled;
//}

//#ifdef CONFIG_PM_AUTOSLEEP
///**
// * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
// * @enabled: Whether to set or to clear the autosleep_enabled flags.
// */
//void pm_wakep_autosleep_enabled(bool set)
//{
//	struct wakeup_source *ws;
//	ktime_t now = ktime_get();
//	int srcuidx;

//	srcuidx = srcu_read_lock(&wakeup_srcu);
//	list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) {
//		spin_lock_irq(&ws->lock);
//		if (ws->autosleep_enabled != set) {
//			ws->autosleep_enabled = set;
//			if (ws->active) {
//				if (set)
//					ws->start_prevent_time = now;
//				else
//					update_prevent_sleep_time(ws, now);
//			}
//		}
//		spin_unlock_irq(&ws->lock);
//	}
//	srcu_read_unlock(&wakeup_srcu, srcuidx);
//}
//#endif /* CONFIG_PM_AUTOSLEEP */

///**
// * print_wakeup_source_stats - Print wakeup source statistics information.
// * @m: seq_file to print the statistics into.
// * @ws: Wakeup source object to print the statistics for.
// */
//static int print_wakeup_source_stats(struct seq_file *m,
//				     struct wakeup_source *ws)
//{
//	unsigned long flags;
//	ktime_t total_time;
//	ktime_t max_time;
//	unsigned long active_count;
//	ktime_t active_time;
//	ktime_t prevent_sleep_time;

//	spin_lock_irqsave(&ws->lock, flags);

//	total_time = ws->total_time;
//	max_time = ws->max_time;
//	prevent_sleep_time = ws->prevent_sleep_time;
//	active_count = ws->active_count;
//	if (ws->active) {
//		ktime_t now = ktime_get();

//		active_time = ktime_sub(now, ws->last_time);
//		total_time = ktime_add(total_time, active_time);
//		if (active_time > max_time)
//			max_time = active_time;

//		if (ws->autosleep_enabled)
//			prevent_sleep_time = ktime_add(prevent_sleep_time,
//				ktime_sub(now, ws->start_prevent_time));
//	} else {
//		active_time = 0;
//	}

//	seq_printf(m, "%-12s\t%lu\t\t%lu\t\t%lu\t\t%lu\t\t%lld\t\t%lld\t\t%lld\t\t%lld\t\t%lld\n",
//		   ws->name, active_count, ws->event_count,
//		   ws->wakeup_count, ws->expire_count,
//		   ktime_to_ms(active_time), ktime_to_ms(total_time),
//		   ktime_to_ms(max_time), ktime_to_ms(ws->last_time),
//		   ktime_to_ms(prevent_sleep_time));

//	spin_unlock_irqrestore(&ws->lock, flags);

//	return 0;
//}

//static void *wakeup_sources_stats_seq_start(struct seq_file *m,
//					loff_t *pos)
//{
//	struct wakeup_source *ws;
//	loff_t n = *pos;
//	int *srcuidx = m->private;

//	if (n == 0) {
//		seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
//			"expire_count\tactive_since\ttotal_time\tmax_time\t"
//			"last_change\tprevent_suspend_time\n");
//	}

//	*srcuidx = srcu_read_lock(&wakeup_srcu);
//	list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) {
//		if (n-- <= 0)
//			return ws;
//	}

//	return NULL;
//}

//static void *wakeup_sources_stats_seq_next(struct seq_file *m,
//					void *v, loff_t *pos)
//{
//	struct wakeup_source *ws = v;
//	struct wakeup_source *next_ws = NULL;

//	++(*pos);

//	list_for_each_entry_continue_rcu(ws, &wakeup_sources, entry) {
//		next_ws = ws;
//		break;
//	}

//	if (!next_ws)
//		print_wakeup_source_stats(m, &deleted_ws);

//	return next_ws;
//}

//static void wakeup_sources_stats_seq_stop(struct seq_file *m, void *v)
//{
//	int *srcuidx = m->private;

//	srcu_read_unlock(&wakeup_srcu, *srcuidx);
//}

///**
// * wakeup_sources_stats_seq_show - Print wakeup sources statistics information.
// * @m: seq_file to print the statistics into.
// * @v: wakeup_source of each iteration
// */
//static int wakeup_sources_stats_seq_show(struct seq_file *m, void *v)
//{
//	struct wakeup_source *ws = v;

//	print_wakeup_source_stats(m, ws);

//	return 0;
//}

//static const struct seq_operations wakeup_sources_stats_seq_ops = {
//	.start = wakeup_sources_stats_seq_start,
//	.next  = wakeup_sources_stats_seq_next,
//	.stop  = wakeup_sources_stats_seq_stop,
//	.show  = wakeup_sources_stats_seq_show,
//};

//static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
//{
//	return seq_open_private(file, &wakeup_sources_stats_seq_ops, sizeof(int));
//}

//static const struct file_operations wakeup_sources_stats_fops = {
//	.owner = THIS_MODULE,
//	.open = wakeup_sources_stats_open,
//	.read = seq_read,
//	.llseek = seq_lseek,
//	.release = seq_release_private,
//};

//static int __init wakeup_sources_debugfs_init(void)
//{
//	debugfs_create_file("wakeup_sources", S_IRUGO, NULL, NULL,
//			    &wakeup_sources_stats_fops);
//	return 0;
//}

//postcore_initcall(wakeup_sources_debugfs_init);
